package com.zjj.reggie.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zjj.reggie.common.CustomExcepion;
import com.zjj.reggie.entity.Category;
import com.zjj.reggie.entity.Dish;
import com.zjj.reggie.entity.Setmeal;
import com.zjj.reggie.mapper.CategoryMapper;
import com.zjj.reggie.service.CategoryService;
import com.zjj.reggie.service.DishService;
import com.zjj.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类
     * @param id
     */
    @Override
    public void remove(Long id) {
        //查询当前分类是否关联了商品，如果有，则抛出异常

        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id查询商品
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        //查询是否有商品
        int count1 = dishService.count(dishLambdaQueryWrapper);

        if (count1 > 0) {
            //已经关联商品，抛出一个业务异常

            throw new CustomExcepion("当前分类下存在商品，不能删除");

        }

        //查询当前分类是否关联套餐，如果有，则抛出异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id查询套餐
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        //查询是否有套餐
        int count2 = setmealService.count(setmealLambdaQueryWrapper);

        if (count2 > 0) {
            //已经关联套餐，抛出一个业务异常
            throw new CustomExcepion("当前分类下存在套餐，不能删除");

        }
        //正常删除
        super.removeById(id);
    }
}
